The spray washing tunnel type powder coating pretreament works by using many spraying nozzles to spray chemicals onto the processed objects for removing contaminats, also combines rinsing stages for washing. It supports for big production requirement in fully automatic lines.

The processing stages of a basic spraying wash system mainly includes degrease, conditioning, phosphate, rinse. Actual stages should be decided and built according to customer's products.

This system mainly includes tunnel chamber, spray nozzles, water tanks, chemical liquid tanks, pump systems, liquid heating device, etc, The chamber and tanks are all fabricated by Stainless Steel for the purpose of anti-rust and long service life.

Automatic Guns & Control Cabinet: A central cabinet combines all the gun controllers for integrated setting of parameters. Our intelligent powder coating gun combined with 100kv spray gun is perfect for coating whether flat panels or complex profiles, easily touching deeping corners and holes.

Powder Coating Reciprocator: Driven by frequency motor, reciprocators carrying spray guns move up and down in programmed stroke and speed. Our reciprocator makes stable, precise motion ensures uniform film thickness and reduce powder waste.

Automatic Powder Feed Center: The system sieves and recycle large quantities of used powders without disturbing your online coating process, at the same time mixing with fresh powders for continuouse feeding, substantially eliminate wastage. The automatic cleaning function increase efficiency during color change.

Workparts automatically transported to the booth working station through conveyor, obtains powder coating by automatic reciprocators. The booth flloor has self-cleaning system that avoids powder accumulation, thus powders are easily and continusouly transferred to the powder feed center for recycling. 

Spray Booth wall can be made of coated cold-rolled steel, PP or stainless steel, anti-static PP material is more recommended to maximize cleaning efficiency & recovery rate. Cyclone is necessary for fast color change demands. After filter unit is to capture superfine powder particles ensure the vented air is clean.

Drying Tunnel Oven is a part after pretreatment washing for drying,  and Curing Tunnel Oven is a part after for powder spraying.  Maximum painting efficiency is obtained with high capacities by means of those systems.

The workparts transpored by conveyors in these tunnels are constantly heated under desired temperature and time. The recommended fuels of tunnel ovens are gas for efficiently heating.

Our tunnel oven is made of 100-150mm rockwool board which minimizes temeprature dropping during long curing time, configured powerful circulation fan circles hot air through the entire chamber, the uniformly heated tunnel with temperature difference less than 3-5 degree.

Overhead conveyors are the most commonly used type for surface finishing. The type of conveyor selected for your operation will depend on the weight, size and even the shape of the items being transported.

Due to the long workpiece, using traditional conveyor in this plant will occupy large factory area. So we suggest to use power and free conveyor, but its speed is too slow. Finally, our engineer combined the traditional conveyor together with power and free conveyor, which greatly saves space and increases working speed.